(especially of a positive feeling) not spoiled by any amount of negative feeling; pure

Spending time with one's family is never an unalloyed pleasure (= there are bad things about it too). 和家人在一起时从来不会只有快乐、没有烦恼。

We had the perfect holiday - two weeks of unalloyed bliss. 我们度过了完美的假期——两周逍遥快活的时光。